Sound reproducing apparatus



April 23, 1935. v. H. SEVERY SOUND REPRODUCING APPARATUS Filed July 15,1929 2 Sheets-Sheet 1 INVENTOR. V/a/a/"fif Sara/y 6 6 ATTORNEYS. v

April 23, 1935. v. H. SEVERY A SOUND REFRODUCING APPARATUS Filed July 15, 1929 2 SheetsSheet 2 IN V EN TOR. flzfor 5e Very TTOR NE Y5.

Patented Apr. 23, 1935 um 'r lazoswi rlis' ployed for controlling reproducing apparatus ifo r translating the light record into sounds. H p The general object of the invention is to pro vide simple and sensitive apparatus for prodlic ing an accurate light record corresponding to the sounds produced; also to produce a simple and accurate-method for producing a light record of 501111584 A further object of the invention topro: duce a. compact light record capable of use to effect reproduction of music or otherso'undse; The invention consists in the novel partsand combination of'parts to be described-hereinafter, all of which contribute to produce an eflicient sound] recording apparatus. p

A preferred embodiment of the invention is described in the followingspecifl'cation,whilethe broad scope of the invention is pointed out in: the appeiidedclaims. r s wm Figureiisadia' V aticvviewwith certcin parts broken away illustrating apparatus embody .5 ing my invention anawmh ma'y'be employed in 'jpracticingnrv method Figure 2 is a vertical section showing partsof the' apparatusillustrated Figure and illusi fi sm m i i h f c fi ij f iiiii whichmay be employed in practicing the inve'nj tion. This viewrepresents apparatus which em ploys static electricityl'forfcontrolling thelight 3 is aviev'v tb'Figure 2 bntshowmagnetic static; means for c nir l ih ght.

1F; is; s! resec ken; a u \o rt e line of ;i'-'igl1re 2;and-. particular ly illustrating a light stop which I prefer to employgin connect-- tion with :the: light .;on-tcathode beam; s. '5 (and 6 :are =twdatical view's illustratingthe'fmanner' in whic the 'co'ntrolled light afiec'ts the variaticngm nttiaijis; i di I+S i Y5 ii F be;

PAT F;

p g I I 1,998,465 sotmn nEPnonUoING APPARATUS l a Victor- 11. seve -y, LcsAngeles, c m. Application July--15, 1929, serial lhfo f 378 2fii i' scrim; (o1.'179"-1co.3) f

'formed along one edge of the 'fili'n Q r a" i n' v' ji a through an; elongate W576i the bea 6 but illustrating a aice'reht 'rbrfii 6:1 1 light stops.

of -moving' icture record'hiving fafl'i is hi record' ill-ustreted has a iorm suc as madej'by a slit of the'typ' "'hovvn uo, .w u A: Figure 10 is *a f'viW-siin'il H I r showing alight recordof he type-i tfwould b produced byslits'ofthef w F1 '7 and 8.3' p j i ur f ti ta'flW hO x a j recording {member fh'e'v r o dsto me ereo Th a a u -b guiding a, lightsensltive example a filrh; aloiigf a pa is o PQ$ n 1th vehemen V. ray is 'p roje'cted onto t J I b v iel fi b tfmt t L yei hs iio bei irqd 6 6* o o sbit eca hp ei' a the light 'passing'onto the re ding me p is P bW 1 39 c stoplocated adjacentto the member, and this rght's'to Figu e s but of the rays of the oath In practice I prefer: s' uchthat the beairi'is, e1

i d l d e? w h,

varying theipositio a light-sensitive recording member of any type whatever.

For the purpose of illustration, however, this recording member in the present specification is in the form of a film and this may, of course, be the same film which is used for taking moving pictures. The apparatus includes a cathode tube 5 (see Fig. 2) which is placed with its longitudinal axis in line with the edge of the recording film. This tube includes the usual means for developing a luminous cathode ray; or beam, indicated at.6, said beam being formed between two terminals receiving current from an electric circuit I, illustrated diagrammatically and including a battery 8 in a local circuit 8- with an interrupter 8 and connecting to a transformer T.

The luminescence of the cathode beam may be attained by maintaining a proper gas and pressure within the tube. The transformer is in a branch of the circuit I wired in parallel with a condenser C.

This cathode ray is developed between two terminals, l0 and H, so that the ray extends longitudinally on the axis of the tube, and so as to project the beam of the tube onto the light-sensitive record, that is to say, a film l2. In accordance with my invention, I provide, adjacent to the film [2, a screen or light stop for intercepting a portion of the rays to form a beam of definite cross section. If desired, this stop may be distinct from the terminal I I, but I prefer to use the terminal II for the stop by forming the terminal of a disc of conducting material and providing it with an elongated slit l3 in line with the cathode beam 6-. In other words, this slit I3 is in a position such that its edges intercept portions of the rays composing the cathode beam.

The cathode beam 6 is preferably given a substantially rectangular form, that is to say, it is elongated along a transverse axis. In order to accomplish this I interpose a screen or light stop I4 having a slit IS in it substantially parallel with the longitudinal axis of the slit I 3 and in line with the same. With this arrangement it will be evident that the screen or light stop M will intercept most of the rays of the cathode beam but will permit a beam of rectangular cross-section to pass to the cathode or terminal I I. I Any suitable means may be employed for producing a relative movement of the beam and the slit l3 to effect variations in the light passing onto the film l2. As illustrated in Figure 2, the means for this purpose includes two condenser plates l6 and I! connected to terminals l3 connected in a circuit l9, including a battery 23 and this circuit passes through an amplifier 2 l, which is also connected in a local sound circuit 22, including a battery 23 and a transmitter 24. It is to be understood that the circuit l3 corresponds to the loud speaker circuit of radio receiving apparatus. In other words, it is a circuit in which the electric pulsations have been amplified from a regular telephonic circuit.

Figure 3 illustrates apparatus similar to that shown in Figure 2 except that instead'of employing condensers l6 and I1, I employ electromagnets 25 disposed opposite to each other and on opposite sides of the cathode beam 26 formed between terminals 21 and 23. Ii desired, the wall of the cathode tube 23 can be oil-set inwardly to form pockets to receive the electro-magnets,

thereby enabling the armatures of the magnets to be brought quite close to the cathode ray.

The coils of the electro-magnets 25 are connected into an electric circuit 36 corresponding to the circuit l9 already described. The apparatus shown in Figure 3 also includes a circuit 3! corresponding to the cathode circuit 1. The circuit 30 is connected up to form an amplifying talking circuit, including amplifier A corresponding to the amplifier 2i, and this amplifier is connected in a local sound circuit 33, including a battery and a transmitter 34, the sound circuitbeing connected up to a transformer 32.

Figure 4 shows the screen or light stop l4 and indicates the position of the slit. Assuming that the film I2 is advanced in a vertical direction the slit l5 would be elongated in a horizontal direction; likewise, as to the slit I3.

.In accordance with my invention, one of the slits 13 or l5 has an inclined edge.

Referring to Figures 5 and 6, indicates the rectangular outline of the cathode beam produced by a rectangular slit l5. These figures indicate a slit l3 having two inclined edges l3 and l3 to cooperate with the beam to intercept more or less of its rays as the relative position of the beam changes with respect to the slit l3.

For example, Figure 6 shows the rectangle 35 of thebeam considerably depressed so that nearly all of the beam is intercepted by the light stop I I.

Figure 5 shows the beam more elevated with a much smaller area'oi. its cross-section intercepted by the light stop. The slit l3, in this case has the form of an isosceles triangle. of such a slit would result in producing a record of the form indicated by the shaded area 36 in Figure 9. In other words, the light-record 31 of the film would have a recording area of symmetrical formwith respectto a longitudinal axis 'I'heuse' and varying in width to correspond with the variations in position of the cathode'beam caused by the pulsations of current in the circuit. This view, Figure 9, indicates the pictures, or frames, 38 which produce the moving pictures when the film is run through a projecting machine. For this purpose the edge of the film opposite the light record 36 may be provided with the usual perforations 39 to cooperate with the feeding mechanism of the camera. This film 40 illustrated in Figure 9 illustrates the character of a record produced by an actor in which the recorded speech on the light record 36 would synchronize with the pictures or frames" 38.

I1. desired, the. slit l3 may have the triangular For example, Figure 8 shows the rectangle of V the beam dropped down to such an extent that onlya verysmallareaotthe beampasses through the slit.

A slit of. the characterindicated in Figures 7 and 8 would produce a light record 44 such as that illustrated in Figure 10, characterized by the.

fact that the inside edge I of the light record would be a straight line and the outer edge a s'uccession of peaks 46. Of course it is immaterial whether the left-hand or right-hand edge is th straight edge.

If desired my invention may be practiced to I produce a plurality of light records on a recording member, for example, a film (see Fig. 11)' consisting of a plurality of zones 61, each zone having a light record 66 upon it. Such a record can be produced by exposing one of the strips 41 at a time to a cathoderay controlled with my onmes es the fllm for intercepting portions of the beam 4 paratus so as to produce a record, for example, a musical record. After forming one of these record strips 41, the film should be adjusted over so as to bring the next strip or zone in line with the axis or the recording tube. In using the apparatus in this way of course the portions of the film not in line with the cathode ray should be kept dark by suitable means to prevent any access of light to them.

In this way a plurality of light records, for example, 6, as illustrated in Figure 11, can be formed on a single film. This film can be carried on a roll and then run through a translat- 'WhatIclaim is:

ing apparatus such as used in moving picture houses so as to efiect sound producing apparatus through the medium of selenium cells or any other light-sensitive apparatus controlling a cur-.

rent through the medium of a light record such as the light records 36 and 44. A record, such as the record 41, could be employed in dwellings to reproduce-the music oioperas and the film enables the records to be of considerable length though occupying very little space.

In the operation of the apparatus it will be.

evident as the sounds are received in the transmitters 24 or'34 they will produce corresponding variations in the impulses in the circuits l9 and 30, therebyjproducing variations in-the magnetic field developed betweenthe condenser plates or between the electro-magnets 25. In this connec-- tion it should be understood that the flat side of the beam 6 or 26 is located toward the terminals;

I donotwish to be limited in the practice of the invention, nor in the claims, to the particulartrolled means adjacent the cathode beam for.

embodiment set forth.

1. In apparatus ior recording sound, the combination of a pair of terminals for an electric circuit, means for developing and projecting a luminous cathode beam between the terminals, means for guiding a light-sensitive film along a path transverse to the direction oi the said beam, and adjacent one of said terminals. the'latter terminal constitutin a light-stop adjacent the path of is only one of themany embodiments this in ntion may take, and

and having'a slit for passing a portion of the beam, a second light-stop adjacent the other'terminal and having a slit to cooperate with the first-named slit to pass portions ot'tlie luminous beam, and sound-controlled means for deflecting the beam between the said terminals and cooperating with the light-stops to project the beam more or less across the edge of the slit of the terminal to vary the light passing to the film.

2. In apparatus for recording sounds, the combination of means for guiding a light sensitive recording member along a path, means for projecting a beam of cathode rays toward the recording member, a light stop in-the path oi the beam intercepting a portion of the rays composing the beam, a second light stop in a direct line with the first named stop and in a direct line with the beam passing from the first named stop and lying adjacent the path of the recording member, said second light stop' having an opening therethrough with an inclined edge, an electric circuit including electrically controlled means adjacent the cathode beam for varying the position of the beam operating to displace the beam more or less across the said inclined edge to vary the area of light passing to the recording member, and sound controlled means for controlling the current in said-circuit.

3. In apparatus for recording sounds, the combination of means for guiding a light sensitive beam and having an opening therein determin- I ing the cross section of the beam, a second light stop having an opening located in a direct line with the first-named opening and in a direct line with the beam passing from the first-named stop,

and lying adjacent the path of the recording member, one of said openings having an inclined edge, an electric circuit'including electrically convarylng the position of the beam and operating to displace the beam more or less as it passes through the second-named light, said inclined .edge of one opening cooperatingwith the edge of the opening in the other stop to vary the area oi-light passing to the recording member, andsound controlled means for controlling the current in said circuit.

, j VICTOR H. SEVERZ. 

